       Re: ReplaceAll problem

• To: mathgroup at smc.vnet.net
• Subject: [mg84478] Re: ReplaceAll problem
• From: Steven Siew <siewsk at bp.com>
• Date: Thu, 27 Dec 2007 03:42:12 -0500 (EST)
• References: <fkt9bf\$6bi\$1@smc.vnet.net>

```On Dec 26, 9:10 pm, Kurda Yon <kurda... at yahoo.com> wrote:
> Hi,
>
> I have the following code
>
> Print["-1-> ", res];
> x = (res /. {A2 -> 0});
> Print["-2-> ", x];
>
> which outputs the following
>
> -1-> -0.023243
> -2-> 0
>
> As we can see from the first Print-output, "res" is just a real
> number. It does not contain the A2. So, why the replacement of A2 by
> zero should change the "res" value?  By the way x = (res /. {A2 -> 0})
> returns -0.023243.
>
> Could you pleas help me to solve the problem?

In:=    res = -0.023243
A2 = res

Out= -0.023243

Out= -0.023243

In:=  Print["-1-> ", res];
x = (res /. {A2 -> 0});
Print["-2-> ", x];

-1 -> -0.023243
-2 -> 0

```

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